Problems and Countermeasures

Master Unit LED		Error	Description [Reference]
BF	ST	Error	Description [Reference]
Light OFF	Green Light Blinking	Normal communication	Normal condition
Light OFF	Green Light ON	Ready for communication	Normal condition
Light OFF	Red Light Blinking	Communication error	See also: Master: Communication Error Slave disconnected from the network (Remote I/O communication error) Slave not added to the network (Scan list collation error) Nonstandard wiring No or too many terminating resistors Noise intrusion
Light OFF	Red Light ON	Data link layer error	See also: Master: Busoff Detection Nonstandard wiring Noise intrusion
Light OFF	Light OFF	Uninitialized network	See also: Master: Uninitialized Network Master unit power error Master unit configuration error
Red Light ON	-	Physical error	See also: Master: Configuration Error Nonstandard wiring Signal wire connection failure Signal wire short circuit

Process Flowchart

* See also:

Symbol	See also:
1	Examining a Problem
2	Master/Slave: Communication Error
3	Slave: Data Link Error
4	Slave: Uninitialized Network
5	Physical Error
6	Master: Data Link Layer Error
7	Master: Uninitialized Network
8	Master: Configuration Error